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DDSR1

7808 in gnd out

DDSR1
10, 688 MHz (10, 712 MHz) Oscillator E1 R16 100 ANTENNA C1 10n R1 47k C36 100n C37 1n REG 7808 Q1 BF245 R15 1k R18 220 L1 0.33µ C2 150 L2 0.39µ C3 270 L3 0.33µ C4 270 C5 150 C38 100n Oscillator Input X1 SOCKET +12V R3 10k Q3 NPN1 C32 1n C33 100n 10, 7 MHz CerRes
7808 in gnd out
SFE107 C15 Regulator
C17 680p R12 22k R13 470 C31 220p
R14 220 C34 CAP
C6 100n
C7 100n
C8 47µ
C16 100 . 400p
7, 5 MHz Low Pass Filter
R2 100 C9
C20 C11 100n 7 6 8 C12 10n 5 R10 100 C14 100n 5 7 8 6 C19 100n IC3 7 8 6 5 +
Output
100n Bypass Vcc Vcc Vcc osc osc osc osc Output A Output B Output A Output B Gain Out C10 1n IC1 DIP8-PHILIPS-SA612A C13 100n Input A Input B SA612A GND C18 QF1 10, 7 MHz Quarzfilter C24 10n QF 10M15 22uH 3k3 R17 C35 4p7 QF 10M15 R11 2, 2k L4 POT2 QF2 10, 7 MHz Quarzfilter C25 C30 1n R9 3k3 C26 100n 1n C27 2.2n 0.47µ R8 Q2 BF245 1n 1 2 3 4 1 2 3 4 C28 IC2 DIP8-PHILIPS-SA612A C21 47n R4 10 R5 1.5k
Input A
Input B
+Input
-Input
SA612A GND
C29 DIP8-NSC-LM386 10µ (Bipolar) LM386 Gain
Q1 BF245
C23 100n 10n R7 2.2k
Principle of DRM Demonstration Receiver
AF Out
DRM Demonstration Shortwave Receiver V0.2 Christoph Petermann DF9CY Start: 7 August 2003 Range 30 kHz . 8, 0 MHz External oscillator required 10, 8 . 20 MHz Upmixing to 1st IF 10, 7 MHz with 10 kHz bandwidth Downmixing to 12 kHz out center frequency
Antenna
8, 5 MHz Lowpass
UpMixer
10, 7 MHz Quarzfilter
DownMixer
AF Amplifier
1st Oscillator 10, 8 .20 MHz DDS
10, 712 MHz Oscillator
DRM Demonstration Shortwave Receiver
V02-Rev1